Quote from: fittsy on February 11, 2017, 06:20:23 PM

Quote from: AzzAz on February 10, 2017, 06:26:24 PM

Quote from: yatta on February 10, 2017, 05:44:39 PM

I've got 2 of those extenders, but they do not work with molex riser - https://www.hashratestore.com/wp-content/uploads/2013/04/powered-pcie-1x-16x-16x-riser-cable-molex.jpg - any idea why ?
Do they need usb risers ?

That one is burned

As @azzAz says that wire is scorched a bit near the 1x PCIe connector. It looks like it overheated. Probably not enough power to the riser or a surge.

USB pcie risers run 1x yellow power wire (12v) and 1x red wire (5v) into the Molex connector. That cheap ass ribbon cable you bought has a single power and no ground wires. Heck, it probably cost you as much as a good PCIe USB riser would.

I sell PCIe risers so take my advice with a grain of salt, but don't you think it's weird that your Molex connector usually has 4 wires running into it but you only have 1 in your ribbon riser?

Best guess is they don't provide a return path for the ground. It's having to ground thru those very small ribbon cables. That's the poorest design I've ever seen. At minimum It should have had a ground accompanying the yellow power wire. I can't say as I've ever seen them made this way. For example something like this. http://m.ebay.com/itm/Two-PCI-E-1x-To-16x-Riser-Card-Ribbon-Extender-Extension-Cable-With-Molex-Power-/262843375665?hash=item3d32afa031%3Ag%3AKmEAAOSwnHZYm2PO&_trkparms=pageci%253A4ab9292f-f0ee-11e6-82e8-74dbd18039d2%257Cparentrq%253A310e1c5915a0a2ab98bf6f3ffffb944d%257Ciid%253A10

The more I dig thru eBay. I can't find any with only one wire. 16x-16x also has power and ground.

BR

Edit some cool stuff coming on pcie 4.0. https://www.synopsys.com/designware-ip/newsletters/technical-bulletin/pci-express-4-lane-margining.html?cmp=IP-SEM&gclid=CKuOiYj7idICFRy5wAodhqgENA